3. Use them with hydroponics, saltwater tank, freshwater tank, gardening, aquariums for power head control, pet bowls, fish tanks, filtration, heating, or what ever your project may be. 1. 0-220V Float Sensor Switch Side Mount Liquid Water Level Sensor Controller Automatic Water Pump Switch Aquarium Tank Pool. 2. A float switch is a device used to sense the level of liquid within a tank, it may actuate a pump, an indicator, an alarm, or other device. 4. The float liquid level switch is a liquid level control device with simple structure and convenient use. It does not need to provide power supply, has no complicated circuit, and has the advantages of smaller volume and longer working life than general mechanical switches. 5. As long as the material is correctly, and any liquid or pressure can be used, it can be used in the shipbuilding industry, generator equipment, petrochemical industry, food industry, water treatment equipment, dyeing and finishing industry, hydraulic machinery, etc. application., Weight: 0.11243575362 Pounds, Manufacturer: Tuidzljd